Synonyms of demonstrator
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dissenterDissenters are people who say that they do not agree with something that other people agree with or that is official policy.
• They do not tolerate dissenters in their ranks.
dissidentDissidents are people who disagree with and criticize their government, especially because it is undemocratic.
• political dissidents
protesterProtesters are people who protest publicly about an issue.
• anti-abortion protesters
Thesaurus for demonstrator from the Collins English Thesaurus
a person who demonstrates equipment, machines, products, etc